Diễn đàn hỗ trợ Firefox

The last 2 days i have had problems signing into my Aliexpress account. The site has told me it is temporarily unavailable, then that the server is taking too long and now that parental controls have been used.

I am 68. I don't need or use my computer for sites that require parental control.

Through extensive troubleshooting, I am unable to get firefox to open at all.

I've done a full uninstall, cleaned all user directories, program files / x86, program data, appdata roaming and local, etc. I used the Microsoft uninstaller and even Revo Uninstaller to remove everything related to Firefox, did a restart and reinstall of the latest one and it still won't launch.

Firefox was previously working until a reboot occurred and now it won't launch.

Firefox 32 bit seems to work when installed, and running Firefox as an admin previously worked but no it no longer does.

I looked at the following articles: - https://support.mozilla.org/en-US/kb/firefox-wont-start-find-solutions - https://support.mozilla.org/en-US/kb/profile-manager-create-remove-switch-firefox-profiles - https://support.mozilla.org/en-US/kb/profile-manager-create-remove-switch-firefox-profiles#w_start-the-profile-manager-when-firefox-is-closed

There's no malware on this machine (business EDR on it, even disabled it as a test and it still didn't open).

I was able to launch the profile manager but now I am unable to as the processes launch in task manager and then within 5 seconds they close.

Firefox is not running in the background for any user (I'm the only one logged in after a reboot as well)

I'm unable to open in troubleshoot mode either. Tried run as and admin cmd "C:\Program Files\Mozilla Firefox\firefox.exe" -safe-mode

Ran SFC / scannow / DISM restore health commands as well and both came back fine / no integrity violations

Is there a way to set a default webcam so website gets access to the not-first-camera by default?

Firefox will ask me if I want to allow a website to access my webcam - I do want the website to access my webcam. But when I choose the correct camera (3rd on the drop-down) and click allow, it just prompts me repeatedly (usually 2-3 times per session, every time I visit the page) if I want to use the camera & have to repeatedly select the 3rd camera on the list. If I check the box to "always allow" then firefox defaults to the first camera on the list, which is a view of my desktop, not actually my webcam (because that's what the first camera in the list is used for - displaying my desktop).

What I want is to set a specific camera to always be allowed on a website, but NEVER let the website have access to the other 4 cameras in the drop-down list. I'd even be okay permanently disabling those 4 cameras from Firefox because I only use them with other applications. I only want firefox to ever use the 3rd camera in the list exclusively, but there doesn't seem to be a way to do that.

The Safari browser on my iPad has a handy feature where you can get it to make a list of all tabs in an open window. I've already searched through the help pages but I don't see this particular thing discussed. I absolutely love feature and hope that Firefox offers it. Or is it only available on a third party extension?

I'm using the latest version of Firefox. Thanks in advance for any help provided.

Every time, but only in the last two days, I try to click through to anything related to American Partisan.org, get a "bad request"error message. I have never had this problem in many years of visiting this site and clicking various linked articles on site. I am still receiving email from this site daily with no problems, but cannot click from the email to the site itself. I am not very computer savvy having grown up using a dial telephone in another millennium. I hope the solution is simple. I have no such problems with the site in question on the same email account on my cell phone. I have no similar problems with any other sites on my computer. Here is the message:

Bad Request

Your browser sent a request that this server could not understand. Size of a request header field exceeds server limit.

Apache Server at default-65-61-8-232 Port 443

They [rimary password quit woking so changed it in mozzzila account which I'm logged into the browser, but it will not allow me to change the primary password in the browser or access a lot of stuff, . I updated the Password in the Mozzilla account, and since doing that the browser fails to sync.

I cannot figure out how to fix this in a lenovo laptop running stupid windows 11

I've used firefox for quite awhile, recently, incognito mode stopped deleting the sites visited while it's in use. It appears that none of the settings have changed. I'm told there is a box to check if you want your history while in the mode to be erased. I do not remember ever having this before and it seems counter intuitive.

I have used FireFox for years now and I am happy but... yesterday after I synced my info across two computers and my Android phone, suddenly my wallpaper selection on my laptop disappeared.

I had a photograph and instead of seeing it? I have a white background and the photographer's name who took the photo but the photo is no longer showing as my wallpaper..

BUT I went to edit the wallpaper and selected a color but it doesnt appear. no item I select from the menu of wallpaper items actually appears on my browser

Please help if you can! Firefox on my other computer is working fine in this regard and this one WAS working fine until yesterday after I synced the devices.

thanks, Keith

Since buying a windows 11 laptop, text on websites on my remote monitor usually appears to be roughly "printed" and lightly "inked", but will temporarily become darker and normal appearing at intervals from 5-30 second, but will soon revert to nearly unreadable. Text appears normal on my connected laptop monitor. The remote monitor text appears and stays normal when I run in firefox troubleshoot mode, but reverts after I turn troubleshoot mode off. I've refreshed firefox, replaced the xulstore.json file. Nothing has helped except running in troublehoot mode. Help!

Firefox is showing a badge on its dock icon. It's a flower. I think! But I have no idea what it means. What does it mean?

(No topic best described my question, so I picked one at random.)

Hello Firefox Support,

I am experiencing a consistent and disruptive performance issue that occurs immediately after certain complex web pages (particularly those with heavy scripting or dynamic content) have fully loaded.

The symptom is a temporary but complete freeze of the Firefox window, often lasting between 5 to 10 seconds, during which time the browser is completely unresponsive. This freeze is accompanied by a significant spike in CPU usage (often reaching 90-100%, according to Task Manager/Activity Monitor).

Details:

Trigger: The freeze reliably occurs right after the page status changes from "Loading" to "Done." I suspect it is related to post-load scripting execution or rendering finalization.

Impact: Any ongoing user interaction is halted until the spike subsides.

Tested Scenarios: I have replicated this on multiple sites, including heavy news aggregators, social media feeds, and complex web applications.

Troubleshooting: This issue persists even after:

Clearing cache and cookies.

Running Firefox in Safe Mode (disabling all extensions).

Creating a new, clean Firefox profile.

This severely degrades the browsing experience, especially when quickly navigating between tabs or starting a session.

Could you please investigate potential issues within the core rendering engine or script execution scheduler that might be causing these severe post-load processing bottlenecks?

Thank you.

my delete history has not been working since yesterday. I have not changed anything to my knowledge in settings so please help in correcting this. I have looked at settings and not sure if something changed or ?

I have not used private settings at all.

Firefox is my default browser. The problems have arisen from around December 27th 2025. Till then everything worked smoothly. The first problem is that if I go to google.com then search for say , “Wordle”. The search output is displayed on the screen but when I click on the search result, it does not go anywhere- nothing happens.

The second issues, is till the problem cropped up, I had set google.com as the custom url for home page and windows through settings, home, and had used an extension, “ New tab override” available from Firefox, to set every new tab to open as google.com The url for the webpage works but the new tab override does not. I have tried removing the extension but problem 1 persists.

The third issue is that I have subscriptions to newspapers and had set up the logins. These newspapers are in my bookmarks. When I click on the bookmark the main page opens but the login area is missing. It tells me to get a subscription. e.g., among others, NY times, Uniqlo gb, the Turnitin of my university will not load although I am logged in to the university. I have cleaned all cookies, removed all extension including Ad blockers to fix the problem, tried resetting all to default setting but nothing works. Would appreciate any help you can provide. Thank you.

In order to connect to Amazon using Firefox on my PC, I am required to scan a QR code with my phone and then, presumably, connect via Firefox or Amazon apps (instructions woefully unclear). It NEVER works. It's no big deal, but it is annoying, particularly since I want to use Firefox as my default browser. I can always connect via Google or Edge. For those of us who aren't tech savvy, why don't you add standard two-factor authentication or Windows Hello as an option?